Aeroplane-propelling mechanism.



'F. HEIDBREDER.

AEROPLANE PROPELLING MECHANISM.

APPLlCATlO-N FILED JULY 3. 1914.

1,172,991. Patented Feb. 22,1916.

wweoom FRED HEIDBREDER, OF QUINC Y, ILLINOIS.

AEROPLANE-PROTPELLING MECHANISM.

To all *whontz't may concern Be it known that I, FRED HEIDBREDER, acitizen of the United States, residin at Quincy, in the county of Adamsand tate. of Illinois, have invented new and useful.

thereby operating gyroscopically to balance an aeroplane, for example,resulting in what is lmown as automatic balance or equilibrium. j

.With the above and other objects in view, thein'vention consists in thenovel construction, combination and arangement of parts,

as herein described, illustrated and claimed.

8.0 aeroplane.

'on' an enlarged scale through one of the propellers- Fig. 3 isa-diametrical vertical '1 is aplan view 'showin A In the accompanyingdrawings :-Figure v the propelling mechanlsm of this invention appliedto an Fig. 2 is a horizontal section section through the same.

the suporting surface of an aeroplane, 2 the frame or fuselage and 3 thetail or horizontal rudder.

In carrying out the present invention, I provide ropelling mechanismembodying two pad le propellers 4. arranged at o posite sides of thelongitudinal center 0 the supporting surface as shown in Fig. 1 andcarried by rotary shafts 5 which are substantially perpendicular to thesupporting Specification of Letters Patent.

Referring to the drawings, 1 designates Witnesses PatentedFeb. 22, acre.

Application filed July 8, 1914. Serial No. 848,916.

surface 1 and to the general direction or path of movement of the craft.

The propellers 4 are driven simultaneously in opposite directions and atequal speed by means of a driving shaft 6 which is connected by gears 7and 8 to the propeller shafts, the shaft 6 being. preferably providedcentrally of the machine with a wheel or pulley 9 to which power may betransmitted by any suitable motor by means of a chain or belt (notshown).

In connection with each of the propellers, I employ a. substantiallycylindrical casing 10 having a central air inlet opening 11 and atangential discharge nozzle or spout 12.

' These casings are arranged reversely to each other as shown in Fig. 1with the discharge nozzles 12 facing rearwardly. Therefore, equaldraftsof air are forced rearwardly by the paddle propellers at'pointsequidistant from the longitudinal center of the machine.

l3'designatesbrackets or frames whereby the propeller casings aremounted on the machine frame, said members 13 also forming bearings forthe propeller shafts 5.

What I claim is The combination with a'supporting surface, of twinrotary paddle propellers arranged at opposite sides of and equidistantlyfrom the longitudinal center-of said surface,

said propellers being mounted to revolve on vertical axes, casing: forsaid propellers having central inlet penings in their sides andtanential discharge nozzles facingrearward y, and a driving shaft gearedpositively to the shafts of both of said pro pellers operating tosimultaneously drive both propellers at the same speed in oppositedirections. v

In testimony whereof I aflix my signature in presence of two witnesses.

. FRED HEIDBREDER.

HERMON HEIDBBEDER, WM. HEIDBRED ER.

